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자료유형
학술저널
저자정보
저널정보
대한생화학·분자생물학회 Experimental and Molecular Medicine Experimental and Molecular Medicine 제36권 제3호
발행연도
2004.1
수록면
220 - 225 (6page)

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The present study was caried out to examine the mechanisms of the synergistic interaction of PAF and A23187 mediated platelet aggregation. We found that platelet aggregation mediated by subthreshold concentrations of PAF (5 nM) and A23187 (1 M) was inhibited by PAF receptor blocker (WEB 2086, IC50 = 0 . 6 5 M) and calcium chanel blockers, diltiazem (IC50 = 1 3 M) and verapamil (IC50 = 1 8 M). Pretreatment of plate-lets with PAF and A23187 induced rise in in-blocked by verapamil. While examing the role of the down stream signaling pathways, we found that platelet aggregation induced by the co-adition of PAF and A23187 was also inhi-bited by low concentrations of phospholipase C (PLC) inhibitor (U7312; IC50 = 10 M), a cyclo-oxygenase inhibitor (indomethacin; IC50 = 0 . 2 M) and inhibitor of TLCK, herbimycin A with IC50 value of 5 M. The efect was also inhibited by a specific TXA2 receptor antagonist, SQ 29548 with very low IC50 value of 0.05 M. However, the inhibitors of MAP kinase, PD98059 and pro-tein kinase C, chelerythrine had no effect on PAF and A23187-induced platelet aggregation. These data sugest that the synergism between PAF and A23187 in platelet aggregation involves activa-tion of thromboxane and tyrosine kinase pathways.

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